gdb/complaints.c

   1 /* Support for complaint handling during symbol reading in GDB.
   2
   3    Copyright (C) 1990-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "complaints.h"
  22 #include "command.h"
  23 #include "gdbcmd.h"
  24 #include "gdbsupport/selftest.h"
  25 #include <unordered_map>
  26 #include <mutex>
  27
  28 /* Map format strings to counters.  */
  29
  30 static std::unordered_map<const char *, int> counters;
  31
  32 /* How many complaints about a particular thing should be printed
  33    before we stop whining about it?  Default is no whining at all,
  34    since so many systems have ill-constructed symbol files.  */
  35
  36 int stop_whining = 0;
  37
  38 #if CXX_STD_THREAD
  39 static std::mutex complaint_mutex;
  40 #endif /* CXX_STD_THREAD */
  41
  42 /* See complaints.h.  */
  43
  44 void
  45 complaint_internal (const char *fmt, ...)
  46 {
  47   va_list args;
  48
  49   {
  50 #if CXX_STD_THREAD
  51     std::lock_guard<std::mutex> guard (complaint_mutex);
  52 #endif
  53     if (++counters[fmt] > stop_whining)
  54       return;
  55   }
  56
  57   va_start (args, fmt);
  58
  59   if (deprecated_warning_hook)
  60     (*deprecated_warning_hook) (fmt, args);
  61   else
  62     {
  63       gdb_puts (_("During symbol reading: "), gdb_stderr);
  64       gdb_vprintf (gdb_stderr, fmt, args);
  65       gdb_puts ("\n", gdb_stderr);
  66     }
  67
  68   va_end (args);
  69 }
  70
  71 /* See complaints.h.  */
  72
  73 void
  74 clear_complaints ()
  75 {
  76   counters.clear ();
  77 }
  78
  79 /* See complaints.h.  */
  80
  81 complaint_interceptor *complaint_interceptor::g_complaint_interceptor;
  82
  83 /* See complaints.h.  */
  84
  85 complaint_interceptor::complaint_interceptor ()
  86   : m_saved_warning_hook (deprecated_warning_hook)
  87 {
  88   /* These cannot be stacked.  */
  89   gdb_assert (g_complaint_interceptor == nullptr);
  90   g_complaint_interceptor = this;
  91   deprecated_warning_hook = issue_complaint;
  92 }
  93
  94 /* A helper that wraps a warning hook.  */
  95
  96 static void
  97 wrap_warning_hook (void (*hook) (const char *, va_list), ...)
  98 {
  99   va_list args;
 100   va_start (args, hook);
 101   hook ("%s", args);
 102   va_end (args);
 103 }
 104
 105 /* See complaints.h.  */
 106
 107 complaint_interceptor::~complaint_interceptor ()
 108 {
 109   for (const std::string &str : m_complaints)
 110     {
 111       if (m_saved_warning_hook)
 112         wrap_warning_hook (m_saved_warning_hook, str.c_str ());
 113       else
 114         gdb_printf (gdb_stderr, _("During symbol reading: %s\n"),
 115                     str.c_str ());
 116     }
 117
 118   g_complaint_interceptor = nullptr;
 119   deprecated_warning_hook = m_saved_warning_hook;
 120 }
 121
 122 /* See complaints.h.  */
 123
 124 void
 125 complaint_interceptor::issue_complaint (const char *fmt, va_list args)
 126 {
 127 #if CXX_STD_THREAD
 128   std::lock_guard<std::mutex> guard (complaint_mutex);
 129 #endif
 130   g_complaint_interceptor->m_complaints.insert (string_vprintf (fmt, args));
 131 }
 132
 133 static void
 134 complaints_show_value (struct ui_file *file, int from_tty,
 135                        struct cmd_list_element *cmd, const char *value)
 136 {
 137   gdb_printf (file, _("Max number of complaints about incorrect"
 138                       " symbols is %s.\n"),
 139               value);
 140 }
 141
 142 #if GDB_SELF_TEST
 143 namespace selftests {
 144
 145 /* Entry point for complaints unit tests.  */
 146
 147 static void
 148 test_complaints ()
 149 {
 150   std::unordered_map<const char *, int> tmp;
 151   scoped_restore reset_counters = make_scoped_restore (&counters, tmp);
 152   scoped_restore reset_stop_whining = make_scoped_restore (&stop_whining, 2);
 153
 154 #define CHECK_COMPLAINT(STR, CNT)                                       \
 155   do                                                                    \
 156     {                                                                   \
 157       std::string output;                                               \
 158       execute_fn_to_string (output, []() { complaint (STR); }, false);  \
 159       std::string expected                                              \
 160         = _("During symbol reading: ") + std::string (STR "\n");        \
 161       SELF_CHECK (output == expected);                                  \
 162       SELF_CHECK (counters[STR] == CNT);                                \
 163     } while (0)
 164
 165 #define CHECK_COMPLAINT_SILENT(STR, CNT)                                \
 166   do                                                                    \
 167     {                                                                   \
 168       std::string output;                                               \
 169       execute_fn_to_string (output, []() { complaint (STR); }, false);  \
 170       SELF_CHECK (output.empty ());                                     \
 171       SELF_CHECK (counters[STR] == CNT);                                \
 172     } while (0)
 173
 174   CHECK_COMPLAINT ("maintenance complaint 0", 1);
 175   CHECK_COMPLAINT ("maintenance complaint 0", 2);
 176   CHECK_COMPLAINT_SILENT ("maintenance complaint 0", 3);
 177   CHECK_COMPLAINT ("maintenance complaint 1", 1);
 178   clear_complaints ();
 179   CHECK_COMPLAINT ("maintenance complaint 0", 1);
 180
 181 #undef CHECK_COMPLAINT
 182 #undef CHECK_COMPLAINT_SILENT
 183 }
 184
 185
 186 } // namespace selftests
 187 #endif /* GDB_SELF_TEST */
 188
 189 void _initialize_complaints ();
 190 void
 191 _initialize_complaints ()
 192 {
 193   add_setshow_zinteger_cmd ("complaints", class_support,
 194                             &stop_whining, _("\
 195 Set max number of complaints about incorrect symbols."), _("\
 196 Show max number of complaints about incorrect symbols."), NULL,
 197                             NULL, complaints_show_value,
 198                             &setlist, &showlist);
 199
 200 #if GDB_SELF_TEST
 201   selftests::register_test ("complaints", selftests::test_complaints);
 202 #endif /* GDB_SELF_TEST */
 203 }